Manchester United boss Sir Alex Ferguson fears Manchester City's tall strikers going in to Sunday's derby.

United shipped three goals at Reading last week.

"It is a worry," said Ferguson.

"If we perform like that on Sunday then God knows what's going to happen to us.

"We've lost 32 goals already - I can't remember us losing so many goals before Christmas.

"Saturday was like Cartoon Cavalcade and when you see City have Balotelli, Dzeko - really tall players - it's going to be a big challenge.

"It's a concern. But that's on Sunday. It's five days away but at this moment in time it feels like five months."